[en] The kinetics of immobile Frenkel defect accumulation is computer simulated by the Monte Carlo method. The dependence of space correlations in the defect distribution on their recombination rate is qualitatively studied. For the simplest case of the instant recombination (the ''black'' sphere model) and for pair-defect correlations of spherical type, an equation has been obtained which describes the process kinetics. The correctness of various theories has been tested for their adequacy to the description of primary-correlated defects accumulation